| 1 | ///////////////////////////////////////////////////////////////////////////// |
| 2 | // Name: dragimag.h |
| 3 | // Purpose: wxDragImage class: a kind of a cursor, that can cope |
| 4 | // with more sophisticated images |
| 5 | // Author: Julian Smart |
| 6 | // Modified by: |
| 7 | // Created: 08/04/99 |
| 8 | // RCS-ID: $Id$ |
| 9 | // Copyright: (c) Julian Smart |
| 10 | // Licence: wxWindows licence |
| 11 | ///////////////////////////////////////////////////////////////////////////// |
| 12 | |
| 13 | #ifndef _WX_DRAGIMAG_H_ |
| 14 | #define _WX_DRAGIMAG_H_ |
| 15 | |
| 16 | #ifdef __GNUG__ |
| 17 | #pragma interface "dragimag.h" |
| 18 | #endif |
| 19 | |
| 20 | #include "wx/bitmap.h" |
| 21 | #include "wx/icon.h" |
| 22 | #include "wx/cursor.h" |
| 23 | #include "wx/treectrl.h" |
| 24 | #include "wx/listctrl.h" |
| 25 | |
| 26 | /* |
| 27 | To use this class, create a wxDragImage when you start dragging, for example: |
| 28 | |
| 29 | void MyTreeCtrl::OnBeginDrag(wxTreeEvent& event) |
| 30 | { |
| 31 | #ifdef __WXMSW__ |
| 32 | ::UpdateWindow((HWND) GetHWND()); // We need to implement this in wxWindows |
| 33 | #endif |
| 34 | |
| 35 | CaptureMouse(); |
| 36 | |
| 37 | m_dragImage = new wxDragImage(* this, itemId); |
| 38 | m_dragImage->BeginDrag(wxPoint(0, 0), this); |
| 39 | m_dragImage->Move(pt, this); |
| 40 | m_dragImage->Show(this); |
| 41 | ... |
| 42 | } |
| 43 | |
| 44 | In your OnMouseMove function, hide the image, do any display updating required, |
| 45 | then move and show the image again: |
| 46 | |
| 47 | void MyTreeCtrl::OnMouseMove(wxMouseEvent& event) |
| 48 | { |
| 49 | if (m_dragMode == MY_TREE_DRAG_NONE) |
| 50 | { |
| 51 | event.Skip(); |
| 52 | return; |
| 53 | } |
| 54 | |
| 55 | // Prevent screen corruption by hiding the image |
| 56 | if (m_dragImage) |
| 57 | m_dragImage->Hide(this); |
| 58 | |
| 59 | // Do some updating of the window, such as highlighting the drop target |
| 60 | ... |
| 61 | |
| 62 | #ifdef __WXMSW__ |
| 63 | if (updateWindow) |
| 64 | ::UpdateWindow((HWND) GetHWND()); |
| 65 | #endif |
| 66 | |
| 67 | // Move and show the image again |
| 68 | m_dragImage->Move(event.GetPosition(), this); |
| 69 | m_dragImage->Show(this); |
| 70 | } |
| 71 | |
| 72 | Eventually we end the drag and delete the drag image. |
| 73 | |
| 74 | void MyTreeCtrl::OnLeftUp(wxMouseEvent& event) |
| 75 | { |
| 76 | ... |
| 77 | |
| 78 | // End the drag and delete the drag image |
| 79 | if (m_dragImage) |
| 80 | { |
| 81 | m_dragImage->EndDrag(this); |
| 82 | delete m_dragImage; |
| 83 | m_dragImage = NULL; |
| 84 | } |
| 85 | ReleaseMouse(); |
| 86 | } |
| 87 | */ |
| 88 | |
| 89 | /* |
| 90 | Notes for Unix version: |
| 91 | Can we simply use cursors instead, creating a cursor dynamically, setting it into the window |
| 92 | in BeginDrag, and restoring the old cursor in EndDrag? |
| 93 | For a really bog-standard implementation, we could simply use a normal dragging cursor |
| 94 | and ignore the image. |
| 95 | */ |
| 96 | |
| 97 | /* |
| 98 | * wxDragImage |
| 99 | */ |
| 100 | |
| 101 | class WXDLLEXPORT wxDragImage: public wxObject |
| 102 | { |
| 103 | DECLARE_DYNAMIC_CLASS(wxDragImage) |
| 104 | public: |
| 105 | |
| 106 | // Ctors & dtor |
| 107 | //////////////////////////////////////////////////////////////////////////// |
| 108 | |
| 109 | wxDragImage(); |
| 110 | wxDragImage(const wxBitmap& image, const wxCursor& cursor = wxNullCursor, const wxPoint& hotspot = wxPoint(0, 0)) |
| 111 | { |
| 112 | m_hImageList = 0; |
| 113 | Create(image, cursor); |
| 114 | } |
| 115 | wxDragImage(const wxIcon& image, const wxCursor& cursor = wxNullCursor, const wxPoint& hotspot = wxPoint(0, 0)) |
| 116 | { |
| 117 | m_hImageList = 0; |
| 118 | Create(image, cursor); |
| 119 | } |
| 120 | wxDragImage(const wxString& str, const wxCursor& cursor = wxNullCursor, const wxPoint& hotspot = wxPoint(0, 0)) |
| 121 | { |
| 122 | m_hImageList = 0; |
| 123 | Create(str, cursor); |
| 124 | } |
| 125 | wxDragImage(const wxTreeCtrl& treeCtrl, wxTreeItemId& id) |
| 126 | { |
| 127 | m_hImageList = 0; |
| 128 | Create(treeCtrl, id); |
| 129 | } |
| 130 | wxDragImage(const wxListCtrl& listCtrl, long id) |
| 131 | { |
| 132 | m_hImageList = 0; |
| 133 | Create(listCtrl, id); |
| 134 | } |
| 135 | ~wxDragImage(); |
| 136 | |
| 137 | // Attributes |
| 138 | //////////////////////////////////////////////////////////////////////////// |
| 139 | |
| 140 | // Operations |
| 141 | //////////////////////////////////////////////////////////////////////////// |
| 142 | |
| 143 | // Create a drag image from a bitmap and optional cursor |
| 144 | bool Create(const wxBitmap& image, const wxCursor& cursor = wxNullCursor, const wxPoint& hotspot = wxPoint(0, 0)); |
| 145 | |
| 146 | // Create a drag image from an icon and optional cursor |
| 147 | bool Create(const wxIcon& image, const wxCursor& cursor = wxNullCursor, const wxPoint& hotspot = wxPoint(0, 0)); |
| 148 | |
| 149 | // Create a drag image from a string and optional cursor |
| 150 | bool Create(const wxString& str, const wxCursor& cursor = wxNullCursor, const wxPoint& hotspot = wxPoint(0, 0)); |
| 151 | |
| 152 | // Create a drag image for the given tree control item |
| 153 | bool Create(const wxTreeCtrl& treeCtrl, wxTreeItemId& id); |
| 154 | |
| 155 | // Create a drag image for the given list control item |
| 156 | bool Create(const wxListCtrl& listCtrl, long id); |
| 157 | |
| 158 | // Begin drag. hotspot is the location of the drag position relative to the upper-left |
| 159 | // corner of the image. |
| 160 | bool BeginDrag(const wxPoint& hotspot, wxWindow* window); |
| 161 | |
| 162 | // End drag |
| 163 | bool EndDrag(wxWindow* window); |
| 164 | |
| 165 | // Move the image: call from OnMouseMove. Pt is in window client coordinates if window |
| 166 | // is non-NULL, or in screen coordinates if NULL. |
| 167 | bool Move(const wxPoint& pt, wxWindow* window); |
| 168 | |
| 169 | // Show the image |
| 170 | bool Show(wxWindow* window); |
| 171 | |
| 172 | // Hide the image |
| 173 | bool Hide(wxWindow* window); |
| 174 | |
| 175 | // Implementation |
| 176 | //////////////////////////////////////////////////////////////////////////// |
| 177 | |
| 178 | // Returns the native image list handle |
| 179 | inline WXHIMAGELIST GetHIMAGELIST() const { return m_hImageList; } |
| 180 | |
| 181 | protected: |
| 182 | WXHIMAGELIST m_hImageList; |
| 183 | wxCursor m_cursor; |
| 184 | wxPoint m_hotspot; |
| 185 | wxPoint m_position; |
| 186 | }; |
| 187 | |
| 188 | #endif |
| 189 | // _WX_DRAGIMAG_H_ |